The device and design features of paint spray guns.
01/10/2017 | ARPSHOP
To the design features, perhaps, still include the mechanism of the trigger lever.
It is designed so that when you press it, the compressed air supply is first opened.
Further pressing causes the ink supply valve to operate.
As already mentioned, there are several adjusting screws on the body of any modern spray gun.
The first, the uppermost (on some spray guns, such as SATA, can be located on the side),
responsible for adjusting the size and shape of the painting torch.
The second is responsible for adjusting the needle stroke and the amount of material fed.
On many spray guns there is also a third screw, by means of which the air supply at the inlet is regulated.
As a rule, it is located down on the handle of the gun. In SATA, this screw is located "behind" - under the screw of the material feed adjustment.
The issue of adjusting the spray gun is to select the right air-to-material ratio.
With the correct balance, these parameters make it possible to achieve the maximum uniformity of the painting torch over the entire width,
and equally uniformly the distribution of the paint material over the surface.
Paint gun system
Depending on the amount of compressed air pressure at the inlet of the spray gun and on the air head (at the outlet), all spray guns can be divided into three main groups:
conventional (high pressure);
HVLP (High Volume Low Pressure - high volume of air and low pressure);
LVLP (Low Volume Low Pressure - low volume of air and low pressure).
To date, the most advanced, economical and satisfying environmental requirements are the last two types of nebulizers.
As the name implies, they are characterized by low working pressure: if conventional conventional guns spray the material at high pressure (about 3-4 bar),
the pistols of the HVLP and LVLP systems are at a low (about 0.7-1.2 bar).
What does it give? The main advantage is the high transfer coefficient of the paint. At low pressure, less paint turns into a useless fog around the part (the so-called overspray,
"dust"), and is more directly transferred to the part. For low-pressure spray guns, the transfer coefficient reaches 65-70% (compared to 30-45% for conventional sprayers).
Considering that paints such as metallic and mother of pearl are not cheap, you can easily calculate how much money a similar spray gun will save for you.